Bishop Exchange Fourth File Rook

rdf:langString Bishop Exchange Fourth File Rook

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rdf:langString In shogi, the Bishop Exchange Fourth File Rook (角交換四間飛車 kaku kōkan shikenbisha) or Open Bishop Diagonal Fourth File Rook (角道オープン四間飛車 kaku michi ōpun shikenbisha) is a Fourth File Rook (Ranging Rook) opening in which the player's bishop diagonal remains open allowing for a bishop exchange to occur early in the opening. Following the bishop exchange, the rook is moved to the Fourth File. This contrasts with the defensive so-called normal or standard Fourth File Rook that keeps the bishop diagonal closed until the player is ready for a counterattack so that they may avoid rough and tumble battles initiated by their opponent. (See: Types of Ranging Rook.) Although it is labelled a Fourth File Rook opening, thanks to the bishop exchange the rook can easily switch to the 8th file (for Black) or to the 2nd file (for White), and hence it also keeps some strong elements of Opposing Rook openings.